I have the same problem. I had to put in a toggle switch in and run the fans like that. It is a pain in the *** because sometimes I either forget to turn them on or turn them off. Damn I need to get that fixed.

 

01, i feel ya man... it erks me that i spent the money for the dang harness and it only works with the AC, heat, or defrost on

its cold out now so the truck hardly hits 210 unless im in mc'ds drive thru for 15mins.. but summer heat is gonna suk so i have to get it fixed

 

Has anybody questioned Allen about this?

 

I have emailed him twice I am just waiting on a response. If I do not get anything by the weekend I will call him and find out or have him send me a new harness.

 

i also had this same problem and i did not have the pin in the proper place...#42 pin....after pushing and pulling and bending the pin i took it to allen and he fixed it in 3 minutes....it works...just have to get it in the right place....

 

I emailed him when I installed mine. It took something like a week to get a response, by that time I had already figured everything out. Although, I emailed him on a Sunday one time and he responded that evening...

 

You guys with the problems: If your manual switch is working properly, then there is nothing wrong with the harness - the problem is in the terminal connector for the PCM.
Either it is not in the Blue pin 42 location or it is not seated properly. It is a very difficult thing to do (getting it seated properly). Check it out.

 

If you manually ground the blue wire that goes to pin 42 and the fans come on low, then you know that everything from there on back is OK, and either the pin isn't seated in the PCM, it's in the wrong spot, or the PCM isn't tuned to ground pin 42...or the PCM could be faulty not allowing pin 42 to ground.

 

thank you snake and bud. i will do when my retune get's here monday.

 

I dont understand unless nelson forgot to tune the PCM for the fans. I had told him about it and I still have not heard from him about it. I double checked everything today and it is all installed right.